disconnecting piping. Loosen the intercooler tube
(2) Remove the cap screw (10) that secures the
pilot valve to the bracket (12) on the compressor;
nuts (14, fig. 4-11) and disengage the ends of the in-
remove the pilot valve.
tercooler assembly (16) from the first stage discharge
c. Cleaning and Inspection.
and second stage inlet ports, Remove the compression
(1) Wipe the exterior of the pilot valve with a
cloth dampened with dry cleaning solvent (fed. spec.
(2) Remove the intercooler safety valve (13) from
the second stage inlet port.
(3) Disconnect and remove tubings and fittings
(2) Inspect the pilot valve for cracks, damaged
threads, and other obvious damage, If the valve is
damaged, or if it fails to control compressor pressure,
b. Cleaning and Inspection.
you must replace it.
(1) Blow dust and dirt from intercooler fins with
compressed air. Flush out the interior of the in-
(l) Installation is the reverse of removal. Refer
tercooler and all tubing with dry cleaning solvent
(fed. spec. P-D-680). Blow compressed air through
(2) After installation, start the engine and allow
them to insure they are open.
reservoir pressure to build up, carefully checking the
(2) Inspect the intercooler for cracks, damaged
cut-out pressure. Release enough air to cause the
cooling fins, dents, and other damage. Straighten
compressor to cut in, carefully checking the cut-in
vent cooling fins. Replace a damaged intercooler.
pressure. Adjust per subparagraph a above if it fails
(3) Inspect the tubing for cracks, clogging, dents,
to control in the 140 to 170 psi range.
restrictions, and other damage; replace damaged
(3) Use a soap bubble solution to check the
system for leaks after installation. Correct any leaks.
(4) Inspect the intercooler safety valve for
cracks, damaged threads, and for sticking or binding
4-45. Air Compressor Air Cleaner
operation. When the valve stem is pulled, it should
move freely under restriction of the valve spring. If
Replace damaged parts. If you note damage that
possible, check the valve using a source of air
requires complete air cleaner replacement, remove
pressure and a gage of known accuracy, The valve
the setscrew (1, fig. 4-11) and pull the air cleaner (2)
should release at 200 psi. Replace if defective.
from the intake unloader assembly. Position a new
c. Reassembly and Installation.
air cleaner in place and tighten the setscrew.
(1) Reassembly and installation is the reverse of
4-46. Air Compressor Intercooler, Piping,
(2) After reassembly, start the engine and allow
the compressor to build up pressure in the reservoir.
a. Removal and Disassembly.
Check lines and fittings for leaks using a soap bubble
(1) Release pressure from air system before
solution. Correct any leaks.
Section XV. LUBRICATING SYSTEM
The hose reels help you to unwind and rewind the
lubricant hoses. Two hose reels dispense chassis
a. The lubricating system dispenses engine oil,
grease, and one hose reel is supplied for each of the
chassis grease, and gear oil from a three-
other two lubricants, The fifth reel supplies com-
by one of three air-driven lubricant pumps (fig. 2-3)
d. Dispensers are mounted at the ends of the hose
reel hoses. The gear oil dispenser (1, fig. 2-4) and the
piping to the hose reels (fig. 2-4) mounted at the rear
engine oil dispenser (3) are measuring types that in-
of the lubricating and servicing unit.
dicate the amount of fluid dispensed. The grease
b. You can control the pumping rate by operating
dispensers (2) are equipped with alternate nozzle tips
individual air pressure regulators (1, fig. 2-3) moun-
to enable you to adapt to a wide variety of grease fit-
ted on each lubricant pump. When you increase air
pressure, you will increase the lubricant pumping
rate. Air pressure gages (2) are mounted on lubricant
4-48. Lubricating System Piping
pumps to allow you to preset pressures to known
a. Removal and Disassembly.
(1) Remove the engine oil hoses (1 and 2, fig. 4-12)
c. Five hose reels are installed on top of the battery
and fittings (3, 4, and 5).
box at the rear of the lubricating and servicing unit.